package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Transactional  //声明方法应该被包含在一个事务中执行
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);    //拷贝对象属性

        //向菜品表dish中插入1条数据
        dishMapper.insert(dish);

        //获取菜品的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //向口味表dish_flavor插入n条数据
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            //批量插入口味数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }


    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        ids.forEach(id -> {
            Dish dish = dishMapper.getById(id);

            //判断当前要删除的菜品状态是否为起售
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //抛出自定义异常并返回错误信息给前端
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });

        //判断当前要删除的菜品是否关联了套餐
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);  //根据菜品id查询关联的所有套餐id
        if (setmealIds != null && setmealIds.size() > 0) {
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

     /*   //删除菜品表中的数据
        ids.forEach(id -> {
            dishMapper.deleteById(id);

            //删除菜品对应的口味数据
            dishFlavorMapper.deleteByDishId(id);
        });*/
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和关联的口味数据
     *
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        //查询菜品表
        Dish dish = dishMapper.getById(id);

        //查询菜品关联的口味
        List<DishFlavor> dishFlavorList = dishFlavorMapper.getByDishId(id);

        //封装成VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavorList);

        return dishVO;
    }
    /**
     * 根据id修改菜品和关联的口味
     *
     * @param dishDTO
     */
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //获取所要修改菜品的id
        Long dishId = dishDTO.getId();

        //修改菜品表dish
        dishMapper.update(dish);

        //删除当前菜品关联的口味数据
        dishFlavorMapper.deleteByDishId(dishId);

        //插入最新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            //批量插入口味数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }
    /**
     * 修改菜品状态
     *
     * @param status
     * @param id
     */
    @Transactional	//涉及修改的操作加入事务管理比较好
    public void startOrStop(Integer status, Long id) {
        Dish dish = dishMapper.getById(id);//获取菜品对象
        dish.setStatus(status);//设置菜品状态
        dishMapper.update(dish);//更新菜品信息

        //如果是停售操作, 则需要将菜品关联的套餐一并停售
        if (status.equals(StatusConstant.DISABLE)) {
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);

            //根据菜品id查询关联的所有套餐id
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);

            if (setmealIds != null && setmealIds.size() > 0) {
                setmealIds.forEach(setmealId -> {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);  //根据套餐id修改套餐信息
                });
            }
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
       Dish dish=Dish.builder()
               .categoryId(categoryId)
               .status(StatusConstant.ENABLE)
               .build();
       return dishMapper.list(dish);
    }


}
